Tehran, Iran: 31st anniversary of the 1979 Islamic revolution

Iranian forces stand guard during a ceremony to mark the anniversary of the 1979 revolution Photograph: Raheb Homavandi/Reuters Photograph: Raheb Homavandi/guardian.co.uk The Iranian president, Mahmoud Ahmadinejad, addresses tens of thousands of Iranians gathered in Azadi ["freedom"] Square in south-western Tehran Photograph: Atta Kenare/AFP/Getty Images Photograph: Atta Kenare/guardian.co.uk Mahmoud Ahmadinejad speaks at the ceremony Photograph: Caren Firouz/Reuters Photograph: Caren Firouz/guardian.co.uk Iranian security forces stand guard as tens of thousands of Iranians gather in Azadi Square Photograph: Atta Kenare/AFP/Getty Images Photograph: Atta Kenare/guardian.co.uk Female students wave Irans national flag during the ceremony Photograph: Abedin Taherkenareh/EPA Photograph: Abedin Taherkenareh/guardian.co.uk Bodyguards flank Mahmoud Ahmadinejad (centre) as his car drives through the crowd after addressing tens of thousands of Iranians gathered in Azadi Square Photograph: Atta Kenare/AFP/Getty Images Photograph: Atta Kenare/guardian.co.uk Iranian women hold posters of the late Iranian supreme leader Ayatollah Ruhollah Khomeini and the current supreme leader Ayatollah Ali Khamenei Photograph: Abedin Taherkenareh/EPA Photograph: Abedin Taherkenareh/guardian.co.uk Iranians hold a caricature of the US president, Barack Obama, during the ceremony Photograph: Abedin Taherkenareh/EPA Photograph: Abedin Taherkenareh/guardian.co.uk An Iranian woman gestures during the ceremony Photograph: Raheb Homavandi/Reuters Photograph: Raheb Homavandi/guardian.co.uk